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[blindboy]

Questions, Questions, Questions!!
I bet you guy's love complete novices asking lots of questions!
Well I hope you can help me.....
I've bought a baitboat catamaran hull approx 65mm wide hulls by about 500mm long.  I reckon the total fully laden weight will be about 6.1kg max
Taking the hull weight off and an allowance for bait i've got about 3kg max to kit out the boat.  Looking at the weight of SLA batteries thats not a lot!

I need a decent run time from the batteries so I've looked around for low drain motors, i've come up with the electonize 543-12 motor, i recon that will draw about 0.8amps with a 3 blade 40mm prop running on 6v batteries.  I'm a little concerned the boat won't be fast enough as the motors ar 4500rpm which seems a lot slower than most motors that i've seen while trawling the www.

As for batteries I think I can go to 2 x 4.5ah batteries from Maplin LC21AC at a weight of 1.8kg or similiar. 

OR would it be better to go for nimh batteries? i've found 6.0V 4600mAh SC NiMH Battery Pack at www.component-shop.co.uk I have no details on the weight yet...

I have no idea which is the best type of battery SLA or NIMH, can anyone please give advice as to the pros/cons suitability of each type.

[blindboy]

OK, another question!
I have made a baitboat before and connected the prop to the motor using a solid coupling and that fitted inside a red plastic housing that screws straight on the front of the motor.

Can anyone tell me what the red plastic housing is called and where can I buy one from?

[toesupwa]

This thread may help...
http://www.modelboatmayhem.co.uk/forum/index.php?topic=2075.0

[blindboy]

Thanks for the thread, I had searched the forum for baitboats before posting and found this thread, most of the info is about pump driven boats, thanks anyway.

[ZZ56]

What does one use a baitboat for, anyways?  I have not heard of them being used here in North America at all.

[Seaspray]

For taking bait out into to the water attracting the fish to where the fisherman can fish from easy. Some of us use a slingshot

Yes we love novices here as it is another person interested in model boats..even the best of us need at times to ask for that little piece of information.

Can anyone tell me what the red plastic housing is called and where can I buy one from? Is this a motor / propshaft coupling ?

[FullLeatherJacket]

Can anyone tell me what the red plastic housing is called and where can I buy one from?

Something like this?

http://www.slecuk.com/catalogue/General-Accessories.html

Their Thrust Pack is code is SL112R - second item on page. I wouldn't use the props supplied with this unit for a bait boat - they are far too "pitchy".

Ref motors - why not a pair of straightforward low-drain 540 motors at about a fiver each? These will run 35mm 3-blade props quite happily on either 6v or 7.2v. 12v is perhaps too much for what in model terms would be quite a small craft. If you really want to use 12v however, then a pair of 385 motors (or 360s) would probably do, but you won't get a speedboat. None of these motors is going to pull much more than 1A each.

NiMH pack are better in as much as you can select a wider range of voltages to try, and they are physically smaller than lead-acid batteries for the same capacity. They also don't require regular top-up charging.

PM me for further details of motors.

FLJ

[blindboy]

Thanks for reply fullleatherjacket most appreciated.

The thrust pack was more than I was looking for! I didn't get the propshaft with it last time, although this one looks longer than I was hoping to use.

I'm interesed in the low drain motors, i used the electronize low drain 543-23 before but the graph shows it pulling more than 3amps on a 35mm prop; http://www.electronize.co.uk/motors.htm

This boat is only likely to be used once in a blue moon, It sounds like the nimh wil stay charged?

[FullLeatherJacket]

The brass tube is a tight push-fit in the glass-nylon moulding, so you can remove it and cut it down to suit. Re-fit with a set-screw through the plastic to stop it rotating. The inner end of the shaft is plain so can also be cut down to suit without the need for re-threading. I can't remember whether the other end of the shaft is M4 or 4BA, however.

I've replied to your PM but, just like Mr Tight Lines, you're going to have to stick your toe in the water and try  something one day! The trouble with drawing boards is that they aren't three feet deep and wet..................

FLJ

[blindboy]

LOL
I just don't want to make to many fundamental errors with my first attempt.

Sounds like nimh batteries are the way to go, they will save me weight although lighten my wallet!!

[tight-lines]

hi,ive just been reading your thread,,and like you asked me on the pm we are in the same boat ,,,,,,but i promise you ,you can have a little more weight in the boat,to allow for the sla batterys,,,but being low to the water its a very risky idea,,,eg it will sink with a good wave,,,,,, ,,,,,,,,,but like the idiot i am ,,,ive taken it weight to the max,,,,,,,its a little lower than the microcat,,,,and thats the most sunk bait boat out there,,,,,,,
i am using 2 x 12v 7amp sla,,,but i think i might change my mind and just stick with my lipo batterys,,,,bcos i didnt allow for any part of th running gear,,and that must weigh,1 kilo,,,,,also when built im filling the boat with expanding foam ,,to keep it from sinking as fast,,,and to keep motor noise and vibration down,,,,
ive gone for the graupner 500e orderd them today from cornwall models,,,,just need to get my mixer now from action,,,,
the electronize are not gona push your boat fast enuff on 6v no way,,im not clued up like these guys,but i know that,,,i didnt buy them bcos they might not of been fast enuff on 12v,,,,,they do 9000rpm on 12v,out of water,,,,
the eco 500e will do 12000 rpm on 12v,,out of water,so i thaught that the 3000rpm,,would come in handy once in the lake,,,,
ive orderd 30ml 3 blade props and some sport 2 blade,,,,just in case it will draw less amps than i expected,and if all else fails ill buy some proper graupner 600 motors,,,,but at a cost of more amps,,,,,
i cant test the weight of the boat in the bath again as there is holes for the props in it at the moment,,,,,
but it took 2x 12v 7 ah,,,,and 3 450g tins of beans to get it so the water was touching the lip sealing edge,,,,
which is two inches higher than the bottom of the middle bridge you wanted it to sit at in the pm,you sent,,,,,,
the sla i used weight approx 2.5 killo each,,,,so at a guess it takes 5 kilo plus the beans = 6.3 killo's to meet the lip,,,,,,,,,which as i said is gona be to much probably,,,but ive maid my bed so now ive got to lie in it ,,,
i also went for 9" long propshafts to run under the battery instead of where neilos put them,,,,my thinking more grease in them bcos of extra length,better seal,,,,also more current draw bcos there hardish to turn,,,,
any way,,,make sure you pm me or post on here what you think about anything,,,i cant reply,,,,bcos im going to my girlfriends mums for 3 days,,but i can read your posts-------long story!--------good luck with the build

[jonny shoreboy]

LOL
I just don't want to make to many fundamental errors with my first attempt.

Sounds like nimh batteries are the way to go, they will save me weight although lighten my wallet!!

You'll find nothing friendly replies to even the dumbest questions. I should know I have asked most of them. The best part is you'll always get someone on here who will be only too glad to help! "Everyone has to start somewhere".

[blindboy]

you sound a god bunch of guys , and a truely international forum.

[Seaspray]

Don't worry about mistakes we all make em.

 Quickest way of learning and Iam still doing it.

[FullLeatherJacket]

It's not advisable to use LiPo batteries with a speed controller which doesn't have an auto low-voltage shut-off. If you discharge a NiMH pack right down then it will just roll over and go to sleep, whereas a LiPo cell which discharges to below its critical voltage can (and probably will) do a fair impersonation of napalm.

If you wish to use the ACTion P94 then stick to NiMH or lead-acid batteries.

FLJ

[blindboy]

The largest capacity nimh batteries that i've found are 13000mah, I'm not sure but I think I can only use a single pack of nimh batteries otherwise I will have problems recharging them while they are in the boat?

That would give me 6.5ah for each motor.

[Anchorboy46]

%%Keep bluffing, I'm learning a lot. Anchorboy

Posting moderated due to language used


Brian

[blindboy]

%%Keep bluffing, I'm learning a lot. Anchorboy

Thanks for your useful input.

[tight-lines]

It's not advisable to use LiPo batteries with a speed controller which doesn't have an auto low-voltage shut-off. If you discharge a NiMH pack right down then it will just roll over and go to sleep, whereas a LiPo cell which discharges to below its critical voltage can (and probably will) do a fair impersonation of napalm.

If you wish to use the ACTion P94 then stick to NiMH or lead-acid batteries.

FLJ

to true!,,,,but bcos of the amount of batterys and the low current drain being pulled it should be hard to pull to much at any one time of sending the boat out,,,,and ill be checking them regulary between sailing,,but you are right yes ,